I guess with a paci you have to weigh up the pros and cons. There is a chance that using the paci to extend naps could result in it becoming a prop BUT at the same time the paci has many benefits for a refluxer, one being the obvious that it helps keep the milk in the tummy and the digestive system moving.
FWIW my refluxer has a paci, at 4 months it became a prop, this meant we had to 'replug' for 2 months when he woke ~2ce i nthe night. Since then he can replug himself and it is now a comfort item not a prop. We made the decision to keep it because it was the lesser of the two evils, without it, there was little sleep, a lot of crying and during teething and GS reflux flares.
Because your LO has just started Losec I would be tempted to say to give it 2 weeks to take effect, Losec was a miracle for us and made a huge difference to Zs reflux. If you can get the reflux fully controlled on the losec then you may not need to worry about using the paci to extend, your LO may start to do it on his own once the discomfort has eased.
Sorry I realised I have written a novel and may be little help, but it is a tough one because each LO is so different KWIM? (HUGS)
